Introduction

This section describes DFS basics.

The RTN510 operates on unlicensed spectrum in sub-6 GHz and can be used free of charge on demand without the need to obtain permission. However, the frequencies are not planned in a uniform manner, and co-channel interference may occur. In addition, radars work within this frequency range (specifically, 5.25–5.35 GHz and 5.47–5.725 GHz). All countries require that the devices operating at this frequency range have the function of actively avoiding causing interference to the radar signals. These problems bring challenges to the planning of operating frequencies for the devices.

Users can specify a list of allowed channels based on the country code and the RTN510 automatically selects its operating frequency. This not only avoids interference and radar signals but also resolves the planning frequencies difficulties.

After the DFS function is enabled, the RTN510 performs automatic frequency scanning based on the configured channel list, and determines the idleness of a channel before selecting it.

If the selected frequency list contains the radar operating frequencies (radar frequencies for short), the RTN510 preferentially selects a non-radar frequency. If a radar frequency has been selected as the operating frequency, the RTN510 automatically selects a new operating frequency at the presence of radar signal transmission.